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After having passed the point where the Itinivini separates from the Cassiquiare, to take its course to the west towards the granitic hills of Daripabo, we found the marshy banks of the river covered with bamboos. These arborescent gramina rise to the height of twenty feet; their stem is constantly arched towards the summit. It is a new species of Bambusa with very broad leaves.
M. Bonpland fortunately found one in flower; a circumstance I mention, because the genera Nastus and Bambusa had before been very imperfectly distinguished, and nothing is more rare in the New World, than to see these gigantic gramina in flower.
On these determinations Guibourt founded a theory of the mode of formation of tabasheer based on the suggestion that at certain periods of its growth the bamboo needed less silica than at other times, and that when not needed, the silica was carried inward and deposited in the interior. The specimens examined were obtained from the Bambusa apus, growing in the Residency of Bantam.
N. Mutis herborised during twenty years in a country where the Bambusa guadua forms marshy forests several leagues broad, without having ever been able to procure the flowers. We sent that learned naturalist the first ears of Bambusa from the temperate valleys of Popayan.
The Bambusa latifolia seems to be peculiar to the basins of the Upper Orinoco, the Cassiquiare, and the Amazon; it is a social plant, like all the gramina of the family of the nastoides; but in that part of Spanish Guiana which we traversed it does not grow in those large masses which the Spanish Americans call guadales, or forests of bamboos.
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